package com.hex.liyue.commonmodule.utils;

/**
 * Created by $cmm on 2016/7/12.
 *
 * 算两个经纬度之间的距离
 */
public class Distance {
    private static final double EARTH_RADIUS = 6378137.0;
    public static void main(String[] args) {
        double lo1 = 108.90, la1 = 34.1;// 第一个经纬度
        double lo2 = 115.4648060, la2 = 38.8738910;// 第二个经纬度
        L.e("经纬度结果","经纬度结果:" + getDistance(lo1, la1, lo2, la2));
        L.e("经纬度结果","经纬度结果:" + getDistance(0, 0, 0, 0));
    }
    // 返回单位是米
    public static double getDistance(double longitude1, double latitude1,
                                     double longitude2, double latitude2) {
        double Lat1 = rad(latitude1);
        double Lat2 = rad(latitude2);
        double a = Lat1 - Lat2;
        double b = rad(longitude1) - rad(longitude2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
                + Math.cos(Lat1) * Math.cos(Lat2)
                * Math.pow(Math.sin(b / 2), 2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000) / 10000;
        return s;
    }
    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }


    /**
     * 根据两点间经纬度坐标（double值），计算两点间距离，
     *
     * @param lat1
     * @param lng1
     * @param lat2
     * @param lng2
     * @return 距离：单位为公里
     */
    public static double DistanceOfTwoPoints(double lat1,double lng1,
                                             double lat2,double lng2) {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
                + Math.cos(radLat1) * Math.cos(radLat2)
                * Math.pow(Math.sin(b / 2), 2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000) / 10000;
        L.i("距离",s+"");
        return s;
    }
}
